Is the diameter of the honeycomb inclined tube in the sedimentation tank the bigger the better?

The inscribed diameter of the honeycomb inclined tube in the sedimentation tank is not as large as possible. The diameter of the inscribed circle of the honeycomb inclined tube packing in the sedimentation tank is 25 mm. An important advantage of the honeycomb inclined tube packing sedimentation tank is that its hydraulic radius is small, so that the Reynolds number of the flow in the honeycomb inclined tube packing is small, and the flow state can be in the laminar or near-layer flow state, satisfying the small turbulence. Requirements. At the same time, the hydraulic radius is small, which can make the water flow have greater stability and strong anti-interference ability. For these reasons, the diameter of the inscribed circle of the hexagonal honeycomb inclined tube packing in the sedimentation tank should not be too large. Of course, in order to prevent siltation in the tube, the diameter of the inscribed circle of the honeycomb inclined tube packing should not be too small, and the engineering control is about 25 mm.

What role can the honeycomb inclined tube packing play in the sedimentation tank: according to the formula of the precipitation efficiency of the ideal sedimentation tank, when the sedimentation speed of the pellet is constant, increasing the surface area of ​​the sedimentation tank can improve the sedimentation efficiency. When the volume of the sedimentation tank is constant, the depth of the inclined tube packing pool is larger, the surface area is larger, and the sedimentation efficiency can be improved. This is called the shallow pool theory. According to this theory, in the initial stage, a multi-layer multi-layer sedimentation tank is added in the sedimentation tank. In order to solve the problem of sludge discharge, the added plate or tube is inclined to form the current hexagonal honeycomb inclined tube packing inclined plate sediment. Pool. The inclined plate or honeycomb inclined tube filler added in the sedimentation tank reduces the sedimentation depth of the particles in the pool, increases the sedimentation area of ​​the sedimentation tank, reduces the hydraulic radius of the sedimentation tank, and reduces the Reynolds number. The number of Lauder increases, and there are better hydraulic conditions, which improves the efficiency of the sedimentation tank.

According to the flow direction of water and mud in the honeycomb inclined tube packing (plate) sedimentation tank, the combined packing (plate) sedimentation tank can be divided into an isotropic flow (upward flow), a cocurrent flow (downward flow) and a lateral flow. Kind. The flow of the opposite flow is opposite to the direction of the sinking of the sinking mud and is 180. The lateral flow is perpendicular to the direction of sliding of the sinking mud to 90. The water flow in the same direction is consistent with the sliding direction of the sinking mud.